using System.Numerics;

public class Program
{
    public static void Main()
    {

        //int num = int.Parse(Console.ReadLine() ?? string.Empty);
        //string[] str = (Console.ReadLine() ?? string.Empty).Trim().Split(' ');
        string str = Console.ReadLine() ?? string.Empty;

        int a = 3-str.Length;

        string d = "";
        for(int i = 0; i < a; i++)
        {
            d += "0";
        }
        Console.WriteLine(d+str);


    }
}